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Mortgage Loans on Real Estate (Summary By Debt Service Coverage and Loan to Value Ratios) (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Commercial Mortgage Loans
Financing Receivable, Credit Quality Indicator [Line Items]
Amortized cost, year one, originated in current fiscal year	$ 90,976	$ 592,095
Average LTV, year one, originated in current fiscal year	63.00%	54.00%
Amortized cost, year two, originated in fiscal year before current fiscal year	$ 593,129	$ 534,839
Average LTV, year two, originated in fiscal year before current fiscal year	54.00%	61.00%
Amortized cost, year three, originated two years before current fiscal year	$ 501,301	$ 688,191
Average LTV, year three, originated two years before current fiscal year	61.00%	64.00%
Amortized cost, year four, originated three years before current fiscal year	$ 662,996	$ 459,451
Average LTV, year four, originated three years before current fiscal year	64.00%	60.00%
Amortized cost, year five, originated four years before current fiscal year	$ 456,478	$ 402,400
Average LTV, year five, originated four years before current fiscal year	60.00%	58.00%
Amortized cost, originated more than five years before current fiscal year	$ 1,301,119	$ 951,526
Average LTV, originated more than five years before current fiscal year	50.00%	47.00%
Mortgage loans, amortized cost	$ 3,605,999	$ 3,628,502
Total - Average LTV	56.00%	56.00%
Commercial Mortgage Loans | Debt Service Coverage Ratio: Greater Than or Equal to 1.5
Financing Receivable, Credit Quality Indicator [Line Items]
Amortized cost, year one, originated in current fiscal year	$ 78,485	$ 260,623
Average LTV, year one, originated in current fiscal year	64.00%	64.00%
Amortized cost, year two, originated in fiscal year before current fiscal year	$ 259,927	$ 454,828
Average LTV, year two, originated in fiscal year before current fiscal year	65.00%	60.00%
Amortized cost, year three, originated two years before current fiscal year	$ 421,975	$ 464,059
Average LTV, year three, originated two years before current fiscal year	59.00%	61.00%
Amortized cost, year four, originated three years before current fiscal year	$ 462,591	$ 344,170
Average LTV, year four, originated three years before current fiscal year	61.00%	58.00%
Amortized cost, year five, originated four years before current fiscal year	$ 344,612	$ 246,854
Average LTV, year five, originated four years before current fiscal year	57.00%	52.00%
Amortized cost, originated more than five years before current fiscal year	$ 968,571	$ 758,494
Average LTV, originated more than five years before current fiscal year	46.00%	45.00%
Mortgage loans, amortized cost	$ 2,536,161	$ 2,529,028
Total - Average LTV	55.00%	55.00%
Commercial Mortgage Loans | Debt Service Coverage Ratio: Greater Than or Equal to 1.2 and Less Than 1.5
Financing Receivable, Credit Quality Indicator [Line Items]
Amortized cost, year one, originated in current fiscal year	$ 0	$ 12,836
Average LTV, year one, originated in current fiscal year	0.00%	67.00%
Amortized cost, year two, originated in fiscal year before current fiscal year	$ 12,698	$ 58,960
Average LTV, year two, originated in fiscal year before current fiscal year	67.00%	66.00%
Amortized cost, year three, originated two years before current fiscal year	$ 58,438	$ 128,301
Average LTV, year three, originated two years before current fiscal year	65.00%	70.00%
Amortized cost, year four, originated three years before current fiscal year	$ 127,455	$ 89,293
Average LTV, year four, originated three years before current fiscal year	69.00%	66.00%
Amortized cost, year five, originated four years before current fiscal year	$ 95,119	$ 135,818
Average LTV, year five, originated four years before current fiscal year	67.00%	66.00%
Amortized cost, originated more than five years before current fiscal year	$ 251,192	$ 129,833
Average LTV, originated more than five years before current fiscal year	60.00%	57.00%
Mortgage loans, amortized cost	$ 544,902	$ 555,041
Total - Average LTV	64.00%	65.00%
Commercial Mortgage Loans | Debt Service Coverage Ratio: Greater Than or Equal to 1.0 and Less Than 1.2
Financing Receivable, Credit Quality Indicator [Line Items]
Amortized cost, year one, originated in current fiscal year	$ 0	$ 318,636
Average LTV, year one, originated in current fiscal year	0.00%	45.00%
Amortized cost, year two, originated in fiscal year before current fiscal year	$ 320,504	$ 17,762
Average LTV, year two, originated in fiscal year before current fiscal year	45.00%	82.00%
Amortized cost, year three, originated two years before current fiscal year	$ 17,648	$ 69,684
Average LTV, year three, originated two years before current fiscal year	82.00%	72.00%
Amortized cost, year four, originated three years before current fiscal year	$ 69,336	$ 11,937
Average LTV, year four, originated three years before current fiscal year	72.00%	75.00%
Amortized cost, year five, originated four years before current fiscal year	$ 2,799	$ 6,343
Average LTV, year five, originated four years before current fiscal year	44.00%	60.00%
Amortized cost, originated more than five years before current fiscal year	$ 47,592	$ 42,125
Average LTV, originated more than five years before current fiscal year	58.00%	58.00%
Mortgage loans, amortized cost	$ 457,879	$ 466,487
Total - Average LTV	52.00%	53.00%
Commercial Mortgage Loans | Debt Service Coverage Ratio: Less Than 1.0
Financing Receivable, Credit Quality Indicator [Line Items]
Amortized cost, year one, originated in current fiscal year	$ 12,491	$ 0
Average LTV, year one, originated in current fiscal year	60.00%	0.00%
Amortized cost, year two, originated in fiscal year before current fiscal year	$ 0	$ 3,289
Average LTV, year two, originated in fiscal year before current fiscal year	0.00%	61.00%
Amortized cost, year three, originated two years before current fiscal year	$ 3,240	$ 26,147
Average LTV, year three, originated two years before current fiscal year	60.00%	63.00%
Amortized cost, year four, originated three years before current fiscal year	$ 3,614	$ 14,051
Average LTV, year four, originated three years before current fiscal year	50.00%	76.00%
Amortized cost, year five, originated four years before current fiscal year	$ 13,948	$ 13,385
Average LTV, year five, originated four years before current fiscal year	76.00%	73.00%
Amortized cost, originated more than five years before current fiscal year	$ 33,764	$ 21,074
Average LTV, originated more than five years before current fiscal year	61.00%	54.00%
Mortgage loans, amortized cost	$ 67,057	$ 77,946
Total - Average LTV	63.00%	65.00%
Agricultural Mortgage Loans
Financing Receivable, Credit Quality Indicator [Line Items]
Amortized cost, year one, originated in current fiscal year	$ 66,743	$ 165,764
Average LTV, year one, originated in current fiscal year	47.00%	54.00%
Amortized cost, year two, originated in fiscal year before current fiscal year	$ 164,616	$ 196,521
Average LTV, year two, originated in fiscal year before current fiscal year	54.00%	49.00%
Amortized cost, year three, originated two years before current fiscal year	$ 190,440	$ 19,714
Average LTV, year three, originated two years before current fiscal year	48.00%	45.00%
Amortized cost, year four, originated three years before current fiscal year	$ 16,288	$ 25,000
Average LTV, year four, originated three years before current fiscal year	43.00%	11.00%
Amortized cost, year five, originated four years before current fiscal year	$ 25,000	$ 0
Average LTV, year five, originated four years before current fiscal year	11.00%	0.00%
Amortized cost, originated more than five years before current fiscal year	$ 0	$ 0
Average LTV, originated more than five years before current fiscal year	0.00%	0.00%
Mortgage loans, amortized cost	$ 463,087	$ 406,999
Total - Average LTV	48.00%	48.00%
Agricultural Mortgage Loans | Debt Service Coverage Ratio: Greater Than or Equal to 1.5
Financing Receivable, Credit Quality Indicator [Line Items]
Amortized cost, year one, originated in current fiscal year	$ 37,099	$ 62,548
Average LTV, year one, originated in current fiscal year	37.00%	54.00%
Amortized cost, year two, originated in fiscal year before current fiscal year	$ 62,058	$ 80,919
Average LTV, year two, originated in fiscal year before current fiscal year	53.00%	56.00%
Amortized cost, year three, originated two years before current fiscal year	$ 78,431	$ 11,645
Average LTV, year three, originated two years before current fiscal year	56.00%	49.00%
Amortized cost, year four, originated three years before current fiscal year	$ 11,553	$ 25,000
Average LTV, year four, originated three years before current fiscal year	48.00%	11.00%
Amortized cost, year five, originated four years before current fiscal year	$ 25,000	$ 0
Average LTV, year five, originated four years before current fiscal year	11.00%	0.00%
Amortized cost, originated more than five years before current fiscal year	$ 0	$ 0
Average LTV, originated more than five years before current fiscal year	0.00%	0.00%
Mortgage loans, amortized cost	$ 214,141	$ 180,112
Total - Average LTV	46.00%	49.00%
Agricultural Mortgage Loans | Debt Service Coverage Ratio: Greater Than or Equal to 1.2 and Less Than 1.5
Financing Receivable, Credit Quality Indicator [Line Items]
Amortized cost, year one, originated in current fiscal year	$ 22,719	$ 95,738
Average LTV, year one, originated in current fiscal year	55.00%	55.00%
Amortized cost, year two, originated in fiscal year before current fiscal year	$ 95,201	$ 102,958
Average LTV, year two, originated in fiscal year before current fiscal year	55.00%	43.00%
Amortized cost, year three, originated two years before current fiscal year	$ 101,189	$ 3,335
Average LTV, year three, originated two years before current fiscal year	42.00%	22.00%
Amortized cost, year four, originated three years before current fiscal year	$ 3,301	$ 0
Average LTV, year four, originated three years before current fiscal year	22.00%	0.00%
Amortized cost, year five, originated four years before current fiscal year	$ 0	$ 0
Average LTV, year five, originated four years before current fiscal year	0.00%	0.00%
Amortized cost, originated more than five years before current fiscal year	$ 0	$ 0
Average LTV, originated more than five years before current fiscal year	0.00%	0.00%
Mortgage loans, amortized cost	$ 222,410	$ 202,031
Total - Average LTV	48.00%	48.00%
Agricultural Mortgage Loans | Debt Service Coverage Ratio: Greater Than or Equal to 1.0 and Less Than 1.2
Financing Receivable, Credit Quality Indicator [Line Items]
Amortized cost, year one, originated in current fiscal year	$ 6,925	$ 7,478
Average LTV, year one, originated in current fiscal year	76.00%	44.00%
Amortized cost, year two, originated in fiscal year before current fiscal year	$ 7,357	$ 4,092
Average LTV, year two, originated in fiscal year before current fiscal year	43.00%	36.00%
Amortized cost, year three, originated two years before current fiscal year	$ 4,064	$ 4,734
Average LTV, year three, originated two years before current fiscal year	36.00%	50.00%
Amortized cost, year four, originated three years before current fiscal year	$ 1,434	$ 0
Average LTV, year four, originated three years before current fiscal year	43.00%	0.00%
Amortized cost, year five, originated four years before current fiscal year	$ 0	$ 0
Average LTV, year five, originated four years before current fiscal year	0.00%	0.00%
Amortized cost, originated more than five years before current fiscal year	$ 0	$ 0
Average LTV, originated more than five years before current fiscal year	0.00%	0.00%
Mortgage loans, amortized cost	$ 19,780	$ 16,304
Total - Average LTV	53.00%	44.00%
Agricultural Mortgage Loans | Debt Service Coverage Ratio: Less Than 1.0
Financing Receivable, Credit Quality Indicator [Line Items]
Amortized cost, year one, originated in current fiscal year	$ 0	$ 0
Average LTV, year one, originated in current fiscal year	0.00%	0.00%
Amortized cost, year two, originated in fiscal year before current fiscal year	$ 0	$ 8,552
Average LTV, year two, originated in fiscal year before current fiscal year	0.00%	59.00%
Amortized cost, year three, originated two years before current fiscal year	$ 6,756	$ 0
Average LTV, year three, originated two years before current fiscal year	46.00%	0.00%
Amortized cost, year four, originated three years before current fiscal year	$ 0	$ 0
Average LTV, year four, originated three years before current fiscal year	0.00%	0.00%
Amortized cost, year five, originated four years before current fiscal year	$ 0	$ 0
Average LTV, year five, originated four years before current fiscal year	0.00%	0.00%
Amortized cost, originated more than five years before current fiscal year	$ 0	$ 0
Average LTV, originated more than five years before current fiscal year	0.00%	0.00%
Mortgage loans, amortized cost	$ 6,756	$ 8,552
Total - Average LTV	46.00%	59.00%

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